The paper reports correlation between processing, structural and magnetic properties of cobalt nanoparticles dispersed in an insulating oxide matrix. High-temperature, chemical decomposition approach was utilized to achieve highly-dispersed, ultra-fine cobalt nanoparticles in silica matrix. Synthesis parameters such as precursor to passivating agent ratio were designed to control the metal-to-o...

We describe structural and magnetic measurements of polycrystalline, L10 chemical-ordered Fe(55-60)Pt(45-40) lms as a function of lm thickness (from 3 to 13 nm) and growth temperature (270 370 C). With increasing lm thickness, the coercivity increases from about 1 kOe up to 11 kOe (growth at 400C), while for increasing growth temperature, the coercivity grows from 0.2 to 6 kOe for 4.3 nm thick ...

Low coercivity is the main disadvantage of RE-Fe-B permanent magnets containing highly abundant rare earths (RE: La, Ce) from the application point of view, even though they exhibit many cost and resource advantages. In this work, an industrial mixed rare earth alloy (RE100 = La30.6Ce50.2Pr6.4Nd12.8) with a high amount of the more abundant elements was adopted to fabricate RE-Fe-B permanent mag...

Keywords: Elliptic equations Nonlocal boundary value problems Difference schemes Stability a b s t r a c t The well-posedness of the Bitsadze–Samarskii type nonlocal boundary value problem in Hölder spaces with a weight is established. The coercivity inequalities for the solution of the nonlocal boundary value problem for elliptic equations are obtained. The stable second order of accuracy diff...

For a general class of linear collisional kinetic models in the torus, including in particular the linearized Boltzmann equation for hard spheres, the linearized Landau equation with hard and moderately soft potentials and the semi-classical linearized fermionic and bosonic relaxation models, we prove explicit coercivity estimates on the associated integro-differential operator for some modifie...

(Bi0.5L0.5)(Fe0.7Co0.3)O3 (L = La, Nd, Sm, Gd, Dy) thin films with ferromagnetism and ferroelectricity were fabricated using pulsed DC sputtering technique to obtain high saturation magnetization, perpendicular magnetic anisotropy large Kerr effect. These properties are very important for realization of performance devices driven by electric field. All had relatively Especially, (Bi0.5Nd0.5)(Fe...

Thin films of oriented tetragonal FePt particles separated by amorphous alumina have been fabricated by electron beam evaporation. The ordering of the FePt particles without coarsening can be tailored by annealing conditions. The value of coercivity of the annealed film reached as high as 4.4 kOe. The perpendicular magnetic coercivity of the annealed film was slightly larger than in-plane coerc...

A model for single-domain uniaxial ferromagnetic particles with high anisotropy, the Ising model, is studied. Recent experimental observations have been made of the probability that the magnetization has not switched, PNOT. Here an approach is described in which it is emphasized that a ferromagnetic particle in an unfavorable field is in fact a metastable system, and the switching is accomplish...

Up to now, investigation of physical properties of ternary and higher nitridometalates has been severely hampered by challenges concerning phase purity and crystal size. Employing a modified lithium flux technique, we are now able to prepare sufficiently large single crystals of the highly air and moisture sensitive nitridoferrate Li2Sr[Li1−xFexN]2 for anisotropic magnetization measurements. Th...

Exchange biasing is studied in Co80Cr20 (CoCr)/FeMn bilayers with a ferromagnetic material granular CoCr. Unique exchange biasing characteristics closely related to the microstructures and magnetization reversal process of granular CoCr have been observed. Although the exchange field in CoCr/FeMn bilayers is inversely proportional to the CoCr layer thickness, similar to the conventional ferroma...